초록 ▼

A flexure for connecting the root end of a rotor end of a rotor blade to a rotor hub in a bearingless rotor assembly. The flexure inherently induces a change in pitch angle in accordance with a change in flap angle. The flexure, which may form an integral portion of the rotor blade, is constructed o

A flexure for connecting the root end of a rotor end of a rotor blade to a rotor hub in a bearingless rotor assembly. The flexure inherently induces a change in pitch angle in accordance with a change in flap angle. The flexure, which may form an integral portion of the rotor blade, is constructed of a composite material made of fibers secured to one another by a bonding agent. The fibers are arranged in two sets. The variation of the blade pitch angle in accordance with the blade flap angle is accomplished by either varying the number of fibers between the two sets or varying the angle of each set to the longitudinal axis of the flexure, or both.

대표청구항 ▼

A composite structure flexure having a longitudinal centerline for connecting a rotor blade having a chord line to a rotor hub in a bearingless rotor assembly, wherein the composite structure comprises fibers held together by a bonding agent, wherein reference Cartesian coordinates for said Flexure

A composite structure flexure having a longitudinal centerline for connecting a rotor blade having a chord line to a rotor hub in a bearingless rotor assembly, wherein the composite structure comprises fibers held together by a bonding agent, wherein reference Cartesian coordinates for said Flexure are chosen such that an X axis is parallel to the longitudinal centerline of the flexure, a Y axis is parallel to the chord line of the blade, and a Z axis is perpendicular to the X and Y axes, wherein a plurality of said fibers are bonded in parallel co-planer relation in the XY plane to form a sheet, a plurality of said sheets comprising first, second, and third sets being bonded together in layers to form said flexure, the fibers of said first set oriented to form a positive angle with the X axis, the fibers of said second set oriented to form a negative angle with the X axis, the fibers of the third set being parallel to the X axis, whereby the resultant flexure allows limited three degrees of freedom of motiong of the blade to permit flap, pitch, and leadlag motion of the blade while inherently inducing a change in pitch angle of the blade in response to a change in flap angle of the blade.